Core i5-8257U vs Core i7-4950HQ

Both the Core i5-8257U and Core i7-4950HQ share an identical 4-core/8-thread configuration. Boost clocks reach 3.9 GHz on the Core i5-8257U versus 3.6 GHz on the Core i7-4950HQ — a 8% clock advantage for the Core i5-8257U (base: 1.4 GHz vs 2.4 GHz). The Core i5-8257U uses the Coffee Lake-U (2018−2019) architecture (14 nm), while the Core i7-4950HQ uses Crystalwell (2013−2014) (22 nm). In PassMark, the Core i5-8257U scores 7,427 against the Core i7-4950HQ's 7,405 — a 0.3% lead for the Core i5-8257U. Cinebench R23 multi-core: 4,017 vs 3,317 (19.1% advantage for the Core i5-8257U). Geekbench 6 single-core — the metric most relevant to gaming — records 1,100 vs 842, a 26.6% lead for the Core i5-8257U that directly translates to higher frame rates. Multi-core Geekbench: 4,000 vs 3,317 (18.7% advantage for the Core i5-8257U). L3 cache: 6 MB on the Core i5-8257U vs 8 MB (total) on the Core i7-4950HQ.

The Core i5-8257U uses the FCBGA1528 socket (PCIe 3.0), while the Core i7-4950HQ uses BGA1364 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2400 on the Core i5-8257U versus DDR3L-1600 on the Core i7-4950HQ — the Core i5-8257U supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 32 GB of RAM. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes. Chipset compatibility: 300 Series (Core i5-8257U) and HM87,QM87 (Core i7-4950HQ).

Virtualization support: VT-x, VT-d (Core i5-8257U) vs Yes (Core i7-4950HQ). Both include integrated graphics — Intel Iris Plus Graphics 645 (Core i5-8257U) and Iris Pro Graphics 5200 (Core i7-4950HQ) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-8257U targets Ultrabook.